Office



(No Model.)

SPARK ARRESTER.

Patented Jan. 10, 1882.

, WITNESSES:

INVENTOR:

ATTORNEYS.

N. PETERS, Fholn-Lilhugmpher. wahin mn. D. c

a UNITED STATES PATENT OFFICE.

GEORGE W. MOORE AND ABRAHAM O. FRIGK, OF WAYNESBOROUGH, PA.

'SPARK-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 252,239, dated January 10, 1882.

- Application filed fNovember 7, 1881. (N model.)

To all whom it may concern:

Be it known that we, GEORGE W. Moose and ABRAHAM O. FRIOK, ot'Waynesborough, in

the county of Franklin and State of Pennsylvania, have invented a new and Improved Spark-Arrester and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which the figure is a vertical longitudinal section of the back end of a horizontal boiler.

Our invention relates to spark-arresters of that kind which are located in the smoke-box of the boiler, or in the space between the ends of the tubes of the boiler and the smoke-stack.

Ineonsists in arranging within the smokebox a perforated and ribbed deflecting-plate extending from the tube-sheet in a nearly horizontal but slightly dipping direction to nearly the back end of the smoke-box, and combining therewith a second deflecting-plate which rises beneath the samefrom the bottom ofthesmokebox to nearly the ribbed and perforated plate, and leaning also to the back of the boiler.

It also consists in making this lower plate adjustable, either bodily or on a pivot,whereby it is made to form either a receptacle for containing the sparks or is made to create a continuous circulation of sparks in the smoke-box,

as hereinafter described.

The invention also further consists in interposing in the smoke-box, between the fines and the smoke-stack, asliding Woven-wire damper, which may be moved so as to permit the draft to pass around it without when the fires are first started and the draft is slugglish, and which, when the steam is up and an artificial draft on, may be made to close this free passage of the draft and compel the smoke and cinders to pass through its perforations or meshes to comminute the sparks, all as hereinafter more fully described.

In the drawing, A represents the back end of a boiler, 13 the tubes, 0 the smoke-stack,

, andD the tube-sheet between which and the back end wall is formed the ordinary smokebox. From this tube-sheet, and extendin gacross the side walls of the smoke-box, is a perforated deflecting-plate, E, having upon its under side going through it,

plate is another, F, which rises from the bottom of the smoke-box and inclines slightly to the rear at its upper end, which latter ap proaches the other plate, E.

Upon the back plate, A, is formed a lip,f, which tends to throw the sparks down into the receptacle in rear ofplate F, and also to deflect the current. The plate F is made adjustable, which permits iteither to fitdown tight against the bottom of the box or be raised above it. We'pref'er to make it adjustable on a pivot, as shown, which also permits its angle to be changed; but it may be adjusted bodily in a more or less vertical direction. down close it forms, with the bottom and rear of the smoke-box, a receptacle to receive the sparks deflected there by the plate E, which sparksare taken out from time to time through the rear door, G, and when it is raised so as to leave an opening between its lower edge and the bottom of the box the said plate F constitutes a center of circulation for the sparks, which pass round and round the same until ground small enough to becarried up by the draft. One or more platesF may be used.

The action of the upper plate is as follows: As the currents of commingled gases, smoke, and cinders come from the fire-flues they strike first the upper plate, E, and are shattered and deflecteddownward thereby, and the perforation and ribs or perform the following functions: If this plate were imperforate, it will be seen that the sparks would follow the center of the current of air and gases, and only the sparks on the outer edges of this current would impinge against the ribs on the plate; but, being perforated, a part of the current passes through and allows the sparks by that means to be thrown against the plate, the ribs. upon which serve to grind up or comminute the same to the desired degree of fineness.

Between the fire-fines and the Smokestack, and preferably above the plate E, is a wovenwire screen, H, which is supported upon a flange, b, and by corresponding flanges, 12, at

When fitting the inner end, and is provided with a handle, 0, extending out through the rear of the smoke box. This screen is arranged to be operated like, and to serve somewhat the functions of, a damper-that is to say, when the handle is pulled out it leaves an open space at the inner end of the screen,through which the products of combustion pass without going through the meshes of the screen, while, when pushed in, this opening is closed, and the products of combustion are forced to pass through the said meshes. The object of this is as follows: If a stationary screen be arranged in the smokebox, it is found that when the fires are first lighted in the furnace, and there is no forced draft, the frictional resistance which these meshes afford makes the natural draft so sluggish that it takes a great while to get up steam; and, besides, the screen becomes clogged with the heavy carbon products from the kindling used, so as to further retard the draft. With our adjustable damper screen it will be seen that when the fires are first lighted the screen is pulled out, so as to afford an unobstructed draft, which allows the fires to quickly burn up. Then, after steam is up and an artificial draft created by the exhaust-nozzle d, the screen is pushed in, and the gases and smoke being compelled to pass through the meshes, all larger and dangerous sparks are sifted out and held in the smoke box until sufliciently comminuted to be harmless.

In distinguishing our invention from what has preceded it we would state that we are aware that deflectingdates of different arrangement have heretofore been placed in the smoke-box of a boiler, and that an open-meshed screen has been fixed in said smoke-box so as to be non adjustable.

We are also aware that a hinged and rotarymoving perforated damper has been used in the smoke-box of an engine; but with such an adjustable damper the alteration of inclination which the hinged connection necessitates involves changes in the direction of the currents, which is objectionable. This is obviated by our sliding woven-wire damper H, which in moving in right lines always preserves the same angular relation to the currents.

Having thus described our invention, what we claim as new is- 1. The combination, with the smoke-box in a steam-boiler, of a deflecting-plate extending from the tube-sheet to nearly the back end of the smoke-box and slightly dipping downward, and-one or more deflectiugplates rising from thebottom of the smoke-box, and adapted to form both a deflecting-plate and a receptacle for sparks in the back end of the smoke-box,

as described.

2. The combination, with'the smoke-box, of

thedeflecting-plate E, perforated and provided with ribs a, and the subjacent plate or plates F, rising from the bottom of the smoke-box, substantially as described.

3. The combination, with the smoke-box, of a deflecting-plate extending from the tubesheet to nearly the back of the smoke-box, and subjacent defiectingplate or plates F, made adjustable, substantially as and for the purpose described.

4. The combination, with the smoke-box of a steam-boiler having guides for rectilinear movement, of a rectilinearly-sliding and openmeshed screen ordamper, H, arranged between the fire-tubes and the smoke-stack, substantially as and for the purpose described.

5. The combination, with'the smoke-box, of the plate E, plate F, and the lip f, substantially as shown and described.

GEORGE W. Moose. ABRAHAM o. FRIOK.

Witnesses:

D. M. Goons, Jr., FREDRIGK FRIOK. 

